Windows boot loader sees two installs of Windows

Windows boot loader sees two installs of Windows

To cut a long story short I ended up with two installs of Win10 on two partitions of the same drive. I then deleted one of these partitions along with its recovery partition. Now when I boot, the boot manager loads and shows two possible windows versions still. However, only the first one will boot (obviously) and the other fails. What is going on here and how to I prevent the boot manager from always opening?

Thanks!

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